"Since First" is one of the most commonly-sung AICSA songbook pieces, and as such is a must-know for every AICSA chorister.
'Since First' was first published in Thomas Ford's "Music of Sundry Kinds" in 1607. Note that Thomas Ford did not write the original (although it is commonly attributed to him); instead, "Music of Sundry Kinds" was a collation of pieces by unknown or obscure composers and songwriters. It is likely, though, that he introduced his own interpretation and alterations to the pieces; as such, with no other known claimant to the authorship of this piece, he is given composer credit 'by default'.
Here are midi (computer music) files for you to download and listen to (If you're using Microsoft Windows, simply click on the link and they should play automatically. If you're not using Windows, I'm going out on a limb and assuming you're technically competent enough to figure things out for yourself....).
Also note that there are midi files of each individual voice part for each piece, so you can hear what each one sounds like - especially your own!
These midi files should give you a fair idea of what each piece - and each individual voice part - sounds like, especially if you're unfamiliar with reading music.
And for those that would like to dowload a viewable and/or printable copy of the score (HINT: most people will want the PDF file; don't try to view the Postscript file unless you know what you're doing):